Here is a list of all emulators (work in progress) that you can use on the Wii.
Apple II/e:
WiiApple > http://gbatemp.net/index.php?showtopic=126996
Commodore 64:
Frodo > http://gbatemp.net/index.php?showtopic=127889
Commodore Amiga:
UAE4Wii > http://gbatemp.net/index.php?showtopic=114794
Gameboy Advance:
Visual Boy Advance GX > http://code.google.com/p/vba-wii/downloads/list
NES:
FCE Ultra GX > http://code.google.com/p/fceugc/downloads/list
Super Nintendo:
SNES9X > http://code.google.com/p/snes9x-gx/downloads/list
Of course I'll need help as there are many I have missed (PC Engine) but I'm lacking time to find all today. So if you know of more emulators or if the above have been updated since then feel free to tell.
Apple II/e:
WiiApple > http://gbatemp.net/index.php?showtopic=126996
Commodore 64:
Frodo > http://gbatemp.net/index.php?showtopic=127889
Commodore Amiga:
UAE4Wii > http://gbatemp.net/index.php?showtopic=114794
Gameboy Advance:
Visual Boy Advance GX > http://code.google.com/p/vba-wii/downloads/list
NES:
FCE Ultra GX > http://code.google.com/p/fceugc/downloads/list
Super Nintendo:
SNES9X > http://code.google.com/p/snes9x-gx/downloads/list
Of course I'll need help as there are many I have missed (PC Engine) but I'm lacking time to find all today. So if you know of more emulators or if the above have been updated since then feel free to tell.